Nitrogen → HCID 69894712, compound

Participants

Reaction Conditions

Reaction Steps

A 30-mL shaker vial was charged with di(tert-butyl) 10-bromo-1,2,4,5,5a,10b-hexahydroazepino[4,5-b]indole-3,6-dicarboxylate (0.10 g, 0.214 mmol), potassium phosphate (0.068 g, 0.32 mmol), benzo[b]furan-2-boronic acid (0.104 g, 0.642 mmol), and DMF (2 mL). The vial was purged with N2, and tetrakis(triphenylphosphine)palladium (0.025 g, 0.02 mmol) was added and the mixture was agitated at 250 RPM with heating at 80° C. overnight. The mixture was filtered through Celite, washing with MeOH (3-5 mL), and sulfonic acid resin (DOWEX®50W-X2, washed and dried, 4.8 meq/g dry weight) was added (1 g). The vial was then purged with N2, capped and agitated at 250 RPM with heating at 65° C. for 36 h. The mixture was filtered through a scintered funnel and the resin was washed 1:1 methylene chloride/methanol and then consecutively washed with MeOH and THF to ensure that all excess reagent was removed from the resin (the methanol and THF washes are alternated to swell and then shrink the resin to help expel reagents from inside the resin). The resin was then washed with 4M ammonium hydroxide in methanol (4×2 ml) and THF (2×2 ml) into an accurately weight round-bottomed flask. The filtrate was concentrated to give 0.042 g (65%) of a beige solid, which was dissolved in methylene chloride and crystallized to give 0.020 g of the title compound as beige solid: MS (EI) m/z 304 (M+), 302, 260, 259, 258, 247, 246, 207, 195, 153; 1H NMR (CDCl3) δ 7.64 (d, J=7 Hz, 1 H), 7.53 (d, J=8 Hz, 1 H), 7.35-7.22 (m, 3 H), 7.15 (t, J=8 Hz, 1 H), 6.63 (d, J=8 Hz, 1 H), 4.38-4.27 (m, 1H), 4.16-4.06 (m, 1 H), 3.28-3.22 (m, 1 H), 3.17-3.11 (m, 1 H), 2.95-2.79 (m, 2 H), 2.38-2.26 (m, 1 H), 2.10-1.89 (m, 2 H), 1.81-1.72 (m, 1 H) ppm.

Provenance & Evidence